WO2014115641A1 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- WO2014115641A1 WO2014115641A1 PCT/JP2014/050744 JP2014050744W WO2014115641A1 WO 2014115641 A1 WO2014115641 A1 WO 2014115641A1 JP 2014050744 W JP2014050744 W JP 2014050744W WO 2014115641 A1 WO2014115641 A1 WO 2014115641A1
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims description 58
- 238000004519 manufacturing process Methods 0.000 title claims description 33
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31105—Etching inorganic layers
- H01L21/31111—Etching inorganic layers by chemical means
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- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/02164—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon oxide, e.g. SiO2
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- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/01—Manufacture or treatment
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/01—Manufacture or treatment
- H10B12/02—Manufacture or treatment for one transistor one-capacitor [1T-1C] memory cells
- H10B12/03—Making the capacitor or connections thereto
- H10B12/033—Making the capacitor or connections thereto the capacitor extending over the transistor
- H10B12/0335—Making a connection between the transistor and the capacitor, e.g. plug
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- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/30—DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells
- H10B12/31—DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells having a storage electrode stacked over the transistor
- H10B12/315—DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells having a storage electrode stacked over the transistor with the capacitor higher than a bit line
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- H10B12/31—DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells having a storage electrode stacked over the transistor
- H10B12/318—DRAM devices comprising one-transistor - one-capacitor [1T-1C] memory cells having a storage electrode stacked over the transistor the storage electrode having multiple segments
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- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/311—Etching the insulating layers by chemical or physical means
- H01L21/31127—Etching organic layers
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- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
- H01L21/76802—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics
- H01L21/76816—Aspects relating to the layout of the pattern or to the size of vias or trenches
Definitions
- the present invention relates to a method for manufacturing a semiconductor device.
- aspect holes As the density of semiconductor devices such as DRAM (Dynamic Random Access Memory) has increased, holes with higher aspect ratios in interlayer insulating films such as silicon oxide films that make up semiconductor devices (hereafter high (Referred to as aspect holes).
- DRAM Dynamic Random Access Memory
- the planar shape of the cylinder hole is preferably circular, but if the closest packing is difficult, an elliptical shape is used. Is desirable.
- the high aspect hole is formed by a dry etching method using a hard mask, and the hard mask tends to be multilayered in order to obtain a required etching selectivity corresponding to the increasing aspect ratio.
- an elliptical pattern is formed on the uppermost layer by photolithography using a reticle provided with an elliptical pattern, and then pattern transfer from the upper layer portion to the lower layer portion of the hard mask is repeated.
- the ellipticity of the pattern gradually decreases due to a decrease in processing accuracy, and when the hard mask is completed, it becomes a nearly circular pattern and forms the necessary elliptical hole. There was a problem that could not be done.
- Patent Document 1 discloses a method of forming a capacitor by using a double patterning method in order to avoid a decrease in pattern transfer accuracy due to lithography characteristics.
- the above Patent Document 1 includes a step of forming an insulating film on a semiconductor substrate, a step of forming a first mask extending in the first direction on the insulating film and having a belt-like pattern, Etching the insulating film with the first mask as a mask to process the insulating film into a strip-like body, and extending the strip-like pattern on the strip in a second direction different from the first direction.
- a columnar body capacitor using a double patterning method comprising: a step of forming a second mask including: a columnar body forming step of etching the strip body using the second mask as a mask to process the strip body into a columnar body
- a method of forming is disclosed.
- the columnar capacitor can only be a columnar side surface, it cannot be applied to a semiconductor device with a small capacitance value and miniaturization. Therefore, a crown structure using the inner and outer surfaces of the lower electrode as a capacitor is required as a capacitor applied to a miniaturized semiconductor device. In this case, it is necessary to form a cylinder hole in the insulating film for forming the lower electrode on the inner surface. Furthermore, it is desirable to form the cylinder hole in an elliptical shape.
- the present invention solves the above-mentioned problems of the prior art and provides a method for manufacturing a semiconductor device capable of making an elliptical cylinder hole with high accuracy.
- a method for manufacturing a semiconductor device includes: Sequentially forming an insulating film and a first material film on a semiconductor substrate; Forming a mask film having a rectangular first opening on the first material film; Dry etching the first material film using the mask film as a mask to form an elliptical second opening having a short side in a first direction in the first material film; Have The step of forming the mask film includes a second material film having a side surface facing the first direction of the first opening, and a third material having a side surface facing the second direction of the first opening. Forming a material film, and The thickness of the third material film is greater than the thickness of the second material film.
- a method for manufacturing a semiconductor device includes: Sequentially forming an insulating film, a first mask film, a second mask film, and a third mask film on a semiconductor substrate; On the first mask film, two side surfaces made of the second mask film facing the first direction, and facing the second direction perpendicular to the first direction, the second mask film and Forming a first opening having a rectangular shape in plan view having two side surfaces made of the third mask film; Dry etching the first mask film exposed in the first opening to form a second opening having an elliptical shape in plan view in the first mask film; Dry etching the insulating film using the first mask film in which the second opening is formed as a mask, and forming an elliptical hole in plan view in the insulating film; It is characterized by having.
- the cylinder hole can be made elliptical with high accuracy.
- FIG. 2 is a cross-sectional view when a hard mask is formed above a silicon substrate in a step of forming a capacitor, and is a diagram in which a broken line portion in FIG. 1B is extracted. It is a figure for demonstrating the pattern formation method (2nd partial mask formation process) to a hard mask. It is a figure for demonstrating the pattern formation method (1st partial mask formation process) to a hard mask.
- FIG. 1A is a plan view of the DRAM 100
- FIG. 1B is a cross-sectional view taken along line A-A 'of FIG.
- the description will mainly refer to FIG. 1 (b), and supplementary explanation will be given as appropriate in FIG. 1 (a).
- a semiconductor substrate 1 (hereinafter referred to as a silicon substrate 1) is provided with a memory cell region in which memory cells are arranged and a peripheral circuit region for driving the memory cells.
- a pair of impurity diffusion regions are arranged in the active region divided by the element isolation region above the silicon substrate 1 in the memory cell region, and a gate insulating film and a gate electrode are stacked on the upper surface of the silicon substrate 1.
- MOS MetalMetaOxide Semiconductor
- the MOS transistor is covered with an interlayer insulating film 2 provided on the upper surface of the silicon substrate 1, and a bit line (not shown) is provided on the upper surface of the interlayer insulating film 2. It is connected to one impurity diffusion region through a first contact plug (not shown) penetrating therethrough.
- the interlayer insulating film 2 and the bit line are both covered with the interlayer insulating film 3, and the contact plug 4 (4a) penetrating the interlayer insulating film 3 is connected to the other via the first contact plug different from the above. Is connected to the impurity diffusion region.
- a stopper film 5 and a lower electrode 7 are provided on the upper surface of the interlayer insulating film 3 so as to cover the contact plug 4. More specifically, the stopper film 5 in the memory cell region and the interlayer insulating film located on the upper surface of the stopper film 5 are provided with cylinder holes (high aspect holes) 11 penetrating each of them.
- a lower electrode 7 having a crown shape is provided on the inner wall.
- the position of the inner wall of the cylinder hole 11 corresponds to the outer wall surface of the lower electrode 7.
- the planar shape of the cylinder hole 11 is an ellipse having a short side in the Y direction (first direction).
- the bottom surface portion of the lower electrode 7 is connected to the upper surface of the contact plug 4 (4 a), and a part of the side surface is connected to the support film 18.
- the support film 18 serves to support each other so that adjacent lower electrodes 7 do not contact each other.
- the inner and outer surface portions and the upper surface portion of the lower electrode 7 are covered with the capacitive insulating film 8 and the upper electrode 9. As a result, the capacitance value is approximately twice as large as that of the columnar capacitor described in Patent Document 1.
- the capacitor 10 is composed of the lower electrode 7, the capacitive insulating film 8, and the upper electrode 9 arranged as described above. Further, as shown in FIG. 1A, the capacitors 10 are arranged in the memory cell region so as to be aligned in the Y direction and the X direction (second direction) perpendicular to the Y direction, and are equally spaced in both directions. The pitch is equal. Further, a support film 18 extending in the Y direction is connected to a part of the side surface of the lower electrode 7 arranged in the Y direction. The inner side of the lower electrode 7 is covered with the upper electrode 9 as shown in the figure. An interlayer insulating film 12 is provided so as to cover the upper electrode 9, and a contact plug 13 penetrating the interlayer insulating film 12 is connected to the upper electrode 9.
- a contact plug 15 is provided in a cylinder hole 14 penetrating the interlayer insulating film 12 and connected to the contact plug 4 (4b).
- a wiring 16 is disposed and connected to the contact plug 15, and the wiring 16 in the memory cell region is connected to the contact plug 13.
- the wiring 16 in each region is covered with an interlayer insulating film 17.
- the capacitance value is increased by providing the capacitor 10 in the cylinder hole 11 having an oval area as much as possible by adopting an elliptical shape.
- the method of manufacturing a semiconductor device according to the present invention is used in the manufacturing process of the cylinder hole 11. Next, referring to FIGS. 11 will be described.
- FIG. 2 is a cross-sectional view when the hard mask 200 is formed above the silicon substrate 1 in the process of forming the capacitor 10, and shows the portion indicated by the broken line in FIG.
- a MOS transistor having a gate insulating film, a gate electrode, and a pair of impurity diffusion layers serving as a source / drain is formed on the silicon substrate 1 by a well-known method. Furthermore, the interlayer insulating film 2 covering the MOS transistor, the first contact plug (not shown) penetrating the interlayer insulating film 2 and connected to the impurity diffusion layer, and the upper surface of some of the first contact plugs are disposed. A bit line (not shown), an interlayer insulating film 3 covering the bit line, and a contact plug 4 (4a) penetrating the interlayer insulating film 3 and connected to the upper surface of the first contact plug are respectively formed by known methods. Form.
- a stopper film 5 which is a 30 nm thick silicon nitride film (SiN) is formed by ALD (Atomic Layer Deposition) method so as to cover the upper surfaces of the interlayer insulating film 3 and the contact plug 4.
- ALD Atomic Layer Deposition
- an interlayer insulating film 6 is formed so as to cover the upper surface of the stopper film 5.
- the interlayer insulating film 6 may be a single layer, but here, after forming an interlayer insulating film 6A of BPSG (Boron Phospho Silicate Glass) having a thickness of 500 nm by a thermal CVD method as a multilayer structure, the thickness is similarly 550 nm.
- An interlayer insulating film 6B made of NSG (Non-doped Silicate Glass) is laminated and formed.
- a support film 18 which is a silicon nitride film having a thickness of 100 nm is formed by an ALD method so as to cover the upper surface of the interlayer insulating film 6B which is an upper layer of the interlayer insulating film 6.
- an interlayer insulating film 19 that is a silicon oxide film (SiO 2 ) having a thickness of 60 nm is formed by plasma CVD so as to cover the upper surface of the support film 18.
- the stopper film 5, the interlayer insulating film 6 (6 ⁇ / b> A, 6 ⁇ / b> B), the support film 18, and the interlayer insulating film 19 are the target films for forming the cylinder hole 11.
- a first mask film which is an amorphous carbon film (amorphous carbon film: hereinafter referred to as an AC film) having a thickness of 500 nm is formed by plasma CVD so as to cover the upper surface of the interlayer insulating film 19.
- a second mask film 21 which is a silicon nitride film 20 and 30 nm thick, and a third mask film 22 which is a silicon oxide film 50 nm thick are sequentially formed.
- the second mask film 21 is a first partial mask for the first mask film 20, and the third mask film 22 is a second partial mask for the first mask film 20.
- the first mask film 20 is a final mask for forming the high aspect hole 11 in the target film.
- the first mask film 20, the second mask film 21, and the third mask film 22 may be collectively referred to as a hard mask 200.
- FIGS. 3 to 8 a pattern forming method on the hard mask 200 will be described with reference to FIGS. 3 to 8 in which the broken line portion in FIG. 2 is extracted.
- (a) is a plan view
- (b) is a cross-sectional view of the BB 'portion in (a)
- (c) is a cross-sectional view of the CC' portion in (a)
- d) is a cross-sectional view of a DD ′ portion in (a)
- (e) is a cross-sectional view of a EE ′ portion in (a).
- the description is mainly given using (a), (b) or (a), (d), and supplements other sectional views as necessary.
- the first opening 23 extending in the Y direction with a width X1 in the X direction of 40 nm is formed in the third mask film 22 by photolithography and dry etching.
- a part of the second mask film 21 is exposed on the bottom surface of the first opening 23.
- BARC Bottom Anti-Reflective Coating
- a photoresist is applied so as to cover the second organic coating film 25 by photolithography, and then a second opening (not shown) extended in the X direction in the photoresist. Z).
- the second opening is orthogonal to the first opening 23 extending in the Y direction, and a part of the second organic coating film 25 is exposed on the bottom surface thereof.
- the exposed second organic coating film 25 and the first organic coating film 24 which was the base of the exposed second organic coating film 25 are removed by dry etching, respectively, and the width in the Y direction is removed.
- a third opening 28 extending in the X direction with Y1 of 40 nm is formed.
- the process gas for removing the second organic coating film 25 uses tetrafluoromethane (CF 4), and the process gas for removing the first organic coating film 24 is nitrogen (N 2 ) and hydrogen (H 2 ). ).
- the etching selection ratio (hereinafter referred to as the selection ratio) of the third mask film 22 with respect to the first organic coating film 24 and the selection ratio of the second mask film 21 with respect to the first organic coating film 24 are 50 or more, respectively. Therefore, a part of the remaining third mask film 22 and a part of the second mask film 21 are exposed on the bottom surface of the third opening 28.
- the third mask film 22 remains on the exposed end portion of the second mask film 21 in the X direction, and is similarly laminated on the end portion in the Y direction.
- the second organic coating film 25 and the first organic coating film 24 remain.
- the exposed second mask film 21 is removed by dry etching to form a first hole 29.
- tetrafluoromethane CF 4
- the organic coating film 25 is also removed, but the first organic coating film 24 remains although the film thickness decreases. Therefore, the side surface in the X direction of the first hole 29 has a laminated structure of the second mask film 21 and the third mask film 22, and similarly, the side surface in the Y direction has the second mask film 21 and the first organic coating.
- a laminated structure of the film 24 is formed. A part of the first mask film 20 is exposed at the bottom of the first hole 29.
- the remaining first organic coating film 24 is removed by dry etching.
- oxygen (O 2 ) is used as the process gas for removing the first organic coating film 24
- the second mask film 21 and the third mask film which are the bases of the removed first organic coating film 24 are used. 22 can remain and be exposed.
- the first mask film 20 exposed on the bottom surface of the first hole 29 remains, although the thickness of about 20 nm is removed, so that the first hole 29 becomes a new second hole 30.
- the side surface in the X direction of the second hole 30 has a laminated structure of a first mask film 20 having a thickness of 20 nm (depth), a second mask film 21 having a thickness of 30 nm, and a third mask film 22 having a thickness of 50 nm. Yes.
- the height Z1 of the side surface in the X direction is the height of the side surface in the Y direction. It is 50 nm higher than Z2. A part of the remaining first mask film 20 is exposed at the bottom of the second hole 30.
- FIG. 8 the process demonstrated in FIG. 8 is called a hard mask formation process.
- the exposed first mask film 20 is removed by dry etching to form a third hole 31.
- the third hole 31 is composed of the first mask film 20, the second mask film 21, and the third mask film 22, and in the future, a part of the third hole 31 in the first mask film 20 will be referred to as the third hole 31A. Called.
- the process conditions in this dry etching are oxygen (O 2 ) and argon (Ar) as process gases, the flow rate is 100 sccm [Standard Cubic Centimeter per Minute] (O 2 ) and 200 sccm (Ar), the high frequency power is 500 W, and the pressure is The pressure was 1.3 Pa.
- a charged reaction product is generated when the second mask film 21 is removed. Therefore, the reaction product is transferred from the upper side of the third hole 31 to the side surface by using a voltage applied to the silicon substrate 1. Electrically attracted and reattached. Since this reaction product functions as a protective film for the third hole 31A, the side etch amount of the third hole 31A can be reduced.
- the width in the X direction of the third hole 31A is 50 nm at the top surface portion (X2), 40 nm at the bottom surface portion (X3), and 70 nm at the maximum portion (X4).
- the width in the Y direction is the top surface portion (Y2). 40 nm, the bottom portion (Y3) is 30 nm, and the maximum portion (Y4) is 50 nm.
- the mask film in the X direction in the third hole 31 is the second mask film 21 with a thickness of 30 nm and the third mask film 22 with a thickness of 50 nm, and the second mask with a thickness of 30 nm in the Y direction. Since only the film 21 is present, the height difference of the mask film in the X direction and the Y direction (hereinafter simply referred to as height difference) is 50 nm.
- the mask film (the second mask film 21 and the third mask film 22) is thick and the distance from the hole opening (the upper surface of the third hole 31) is long. Since the object mainly reattaches to the mask film and does not reattach to the third hole 31A, the mask film (second mask film 21) is thin in the Y direction and the distance from the hole opening is short. Then, it reattaches to the inner wall of the third hole 31A.
- the mask film thickness is thick and the protective film is hardly formed, side etching proceeds, whereas in the Y direction, the mask film thickness is small and reaches the lower part. Since it is covered with a protective film, side etching hardly occurs.
- the side etch amount depends on the mask film thickness. As the mask film thickness increases, the maximum width increases. It is clear from this. As described above, the third hole 31A becomes elliptical because the arrival depth of the reattached reaction product is different between the X direction and the Y direction, and side etching proceeds in the X direction. Thus, the major axis is longer, and the side etch is less likely to occur in the Y direction.
- the height difference is set to 50 nm. However, if the ellipticity is to be increased, the height difference may be further increased. If the ellipticity is to be reduced and approximated to a circle, the height difference may be decreased.
- the depth Z3 at which the maximum portion occurs in the X direction is the same depth as the depth Z4 at which the maximum portion occurs in the Y direction. This is because in the third hole 31A, which is a narrow space, the side etch action decreases as the distance (depth) from the upper part that becomes the opening increases, so that the side surface in the Y direction is covered to the lower part. This is because the reaction product film gradually disappears from the upper part.
- the hard mask 200 is completed, and a part of the interlayer insulating film 19 is exposed at the bottom of the third hole 31.
- FIG. 10 and FIG. 11 are not partial views so far but are the same general views as FIG.
- the remaining first mask film 20 is removed by an etch-back method, so that the side surfaces of the interlayer insulating film 19, the support film 18, and the interlayer insulating film 6 (6A, 6B) are The cylinder hole 11 constituted by the stopper film 5 is completed. Note that at least a part of the upper surface of the contact plug 4 is exposed on the bottom surface of the cylinder hole 11.
- the hard mask used when forming the cylinder hole by the dry etching method has a height difference.
- the reattachment area of reactive organisms generated by subsequent dry etching is controlled by the difference in height of the hard mask, and the cylinder hole is made accurate by creating a significant difference in the amount of side etching in the X and Y directions in the cylinder hole. It can be made oval well.
- an insulating film (19, 18, 6) and a first material film (20) are sequentially formed on a semiconductor substrate, and the first material film is formed on the first material film.
- a step of forming a mask film having a rectangular first opening; and a mask in which the first material film is dry-etched using the mask film as a mask to form an elliptical second opening in the first material film includes a second material film (21) having a side surface facing the first direction of the first opening and a second of the first opening. Forming a third material film (21 + 22) having side surfaces opposed to each other, wherein the thickness of the third material film is greater than the thickness of the second material film. It has become.
- an insulating film (19, 18, 6), a first mask film (20), a second mask film (21), and a third mask film ( 22) sequentially, and on the first mask film, in two directions opposite to the first direction and made of the second mask film, and in a second direction perpendicular to the first direction.
- a step of forming a first opening having a rectangular shape in plan view having two side faces made of the second mask film and the third mask film facing each other, and the first mask film exposed in the first opening Forming a second opening having a plan view elliptical shape in the first mask film, and dry etching the insulating film using the first mask film in which the second opening is formed as a mask. Forming a hole having an elliptical shape in plan view in the insulating film. It has become a method of manufacturing the body device.
- the thickness of the mask film facing in the second direction is made thicker than the thickness of the mask film facing in the first direction.
- the bowing is generated and widened in the first direction, and the bowing is suppressed in the first direction. That is, it is not widened in the first direction. Therefore, it is possible to form an elliptical hole having a long side in the second direction and a short side in the first direction.
- the reason why the hole having an elliptical shape in plan view can be formed in this way is because the amount of bowing generated utilizes the characteristic of dry etching that depends on the thickness of the mask film.
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Abstract
Description
半導体基板上に絶縁膜、第1の材料膜を順次形成する工程と、
前記第1の材料膜上に矩形の第1の開口を有するマスク膜を形成する工程と、
前記マスク膜をマスクとして前記第1の材料膜をドライエッチングし、前記第1の材料膜に第1の方向に短辺を有する楕円形の第2の開口を形成する工程と、
を有し、
前記マスク膜を形成する工程は、前記第1の開口の第1の方向に対向する側面を有する第2の材料膜と、前記第1の開口の第2方向に対向する側面を有する第3の材料膜と、を形成する工程を含み、
前記第3の材料膜の厚さは前記第2の材料膜の厚さより厚いことを特徴とする。
半導体基板上に絶縁膜、第1のマスク膜、第2のマスク膜および第3のマスク膜を順次形成する工程と、
前記第1のマスク膜上に、第1の方向に対向し前記第2のマスク膜からなる2つの側面と前記第1の方向に垂直な第2の方向に対向し前記第2のマスク膜および前記第3マスク膜からなる2つの側面とを有する平面視矩形の第1の開口を形成する工程と、
前記第1の開口内に露出する前記第1のマスク膜をドライエッチングし平面視楕円形の第2の開口を第1のマスク膜に形成する工程と、
前記第2の開口が形成された前記第1のマスク膜をマスクとして前記絶縁膜をドライエッチングし、前記絶縁膜に平面視楕円形のホールを形成する工程と、
を有することを特徴とする。
2 層間絶縁膜
3 層間絶縁膜
4 コンタクトプラグ
5 ストッパー膜
6 層間絶縁膜
7 下部電極
8 容量絶縁膜
9 上部電極
10 キャパシタ
11 シリンダホール
12 層間絶縁膜
13 コンタクトプラグ
14 シリンダホール
15 コンタクトプラグ
16 配線
17 層間絶縁膜
18 サポート膜
19 層間絶縁膜
20 第1マスク膜
21 第2マスク膜
22 第3マスク膜
23 第1開口部
24 第1有機塗布膜
25 第2有機塗布膜
28 第3開口部
29 第1ホール
30 第2ホール
31 第3ホール
200 ハードマスク
Claims (22)
- 半導体基板上に絶縁膜、第1の材料膜を順次形成する工程と、
前記第1の材料膜上に矩形の第1の開口を有するマスク膜を形成する工程と、
前記マスク膜をマスクとして前記第1の材料膜をドライエッチングし、前記第1の材料膜に第1の方向に短辺を有する楕円形の第2の開口を形成する工程と、
を有し、
前記マスク膜を形成する工程は、前記第1の開口の第1の方向に対向する側面を有する第2の材料膜と、前記第1の開口の第2方向に対向する側面を有する第3の材料膜と、を形成する工程を含み、
前記第3の材料膜の厚さは前記第2の材料膜の厚さより厚いことを特徴とする半導体装置の製造方法。 - 前記第1の材料膜のドライエッチングで生じる反応生成物を前記第2の開口の側面に再付着させることにより、前記反応生成物を前記第2の開口の保護膜として機能させることを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記反応生成物を前記第2の開口の保護膜として機能させることにより、前記第2の開口に対するサイドエッチのサイドエッチ量を低減させることを特徴とする請求項2に記載の半導体装置の製造方法。
- 前記反応生成物は、前記半導体基板に印加した電圧を利用して、前記第2の開口の上方から側面へ電気的に引き寄せられて前記第2の開口の側面に再付着することを特徴とする請求項2又は3に記載の半導体装置の製造方法。
- 前記第2の開口は、前記第2の方向では前記サイドエッチが進行して長径となり、前記第1の方向では前記サイドエッチが進行し難く短径となることにより、前記楕円形として形成されることを特徴とする請求項3又は4に記載の半導体装置の製造方法。
- 前記第3の材料膜の厚さと前記第2の材料膜の厚さの差を大きくすることにより前記第2の開口の楕円率が大きくなり、前記厚さの差を小さくすることにより前記第2の開口の楕円率が小さくなることを特徴とする請求項1から5のいずれか1項に記載の半導体装置の製造方法。
- 前記絶縁膜は、少なくとも、ストッパー膜と、前記ストッパー膜上に形成された第1の層間絶縁膜と、前記第1の層間絶縁膜上に形成されたサポート膜と、前記サポート膜上に形成された第2の層間絶縁膜を有することを特徴とする請求項1から6のいずれか1項に記載の半導体装置の製造方法。
- 前記第1の材料膜は、前記第2の層間絶縁膜の上面を覆うように、プラズマCVD法によって形成された非晶質炭素膜であることを特徴とする請求項7に記載の半導体装置の製造方法。
- 前記第2の材料膜は、前記第1材料膜上に、プラズマCVD法によって形成されたシリコン窒化膜であることを特徴とする請求項8に記載の半導体装置の製造方法。
- 前記第3の材料膜は、前記第1の材料膜上に、プラズマCVD法によって形成されたシリコン酸化膜を少なくとも有することを特徴とする請求項8又は9に記載の半導体装置の製造方法。
- 前記第3の材料膜は、前記シリコン窒化膜と前記シリコン酸化膜の積層構造で形成されることを特徴とする請求項10に記載の半導体装置の製造方法。
- 半導体基板上に絶縁膜、第1のマスク膜、第2のマスク膜および第3のマスク膜を順次形成する工程と、
前記第1のマスク膜上に、第1の方向に対向し前記第2のマスク膜からなる2つの側面と前記第1の方向に垂直な第2の方向に対向し前記第2のマスク膜および前記第3マスク膜からなる2つの側面とを有する平面視矩形の第1の開口を形成する工程と、
前記第1の開口内に露出する前記第1のマスク膜をドライエッチングし平面視楕円形の第2の開口を第1のマスク膜に形成する工程と、
前記第2の開口が形成された前記第1のマスク膜をマスクとして前記絶縁膜をドライエッチングし、前記絶縁膜に平面視楕円形のホールを形成する工程と、
を有することを特徴とする半導体装置の製造方法。 - 前記第1のマスク膜のドライエッチングで生じる反応生成物を前記第2の開口の側面に再付着させることにより、前記反応生成物を前記第2の開口の保護膜として機能させることを特徴とする請求項12に記載の半導体装置の製造方法。
- 前記反応生成物を前記第2の開口の保護膜として機能させることにより、前記第2の開口に対するサイドエッチのサイドエッチ量を低減させることを特徴とする請求項13に記載の半導体装置の製造方法。
- 前記反応生成物は、前記半導体基板に印加した電圧を利用して、前記第2の開口の上方から側面へ電気的に引き寄せられて前記第2の開口の側面に再付着することを特徴とする請求項13又は14に記載の半導体装置の製造方法。
- 前記第2の開口は、前記第2の方向では前記サイドエッチが進行して長径となり、前記第1の方向では前記サイドエッチが進行し難く短径となることにより、前記平面視楕円形として形成されることを特徴とする請求項14又は15に記載の半導体装置の製造方法。
- 前記第2の方向に対向し前記第2のマスク膜および前記第3マスク膜からなる2つの側面の高さは、前記第1の方向に対向し前記第2のマスク膜からなる2つの側面の高さよりも高いことを特徴とする請求項12から16のいずれか1項に記載の半導体装置の製造方法。
- 前記第2のマスク膜および前記第3マスク膜からなる2つの側面の高さと、前記第2のマスク膜からなる2つの側面の高さの高低差を大きくすることにより前記第2の開口の楕円率が大きくなり、前記高低差を小さくすることにより前記第2の開口の楕円率が小さくなることを特徴とする請求項17に記載の半導体装置の製造方法。
- 前記絶縁膜は、少なくとも、ストッパー膜と、前記ストッパー膜上に形成された第1の層間絶縁膜と、前記第1の層間絶縁膜上に形成されたサポート膜と、前記サポート膜上に形成された第2の層間絶縁膜を有することを特徴とする請求項12から18のいずれか1項に記載の半導体装置の製造方法。
- 前記第1のマスク膜は、前記第2の層間絶縁膜の上面を覆うように、プラズマCVD法によって形成された非晶質炭素膜であることを特徴とする請求項19に記載の半導体装置の製造方法。
- 前記第2のマスク膜は、前記第1のマスク膜上に、プラズマCVD法によって形成されたシリコン窒化膜であることを特徴とする請求項20に記載の半導体装置の製造方法。
- 前記第3のマスク膜は、前記第2のマスク膜上に、プラズマCVD法によって形成されたシリコン酸化膜であることを特徴とする請求項20又は21に記載の半導体装置の製造方法。
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- 2014-01-17 KR KR1020157022791A patent/KR20150109466A/ko active IP Right Grant
- 2014-01-17 DE DE112014000543.6T patent/DE112014000543B4/de active Active
- 2014-01-17 WO PCT/JP2014/050744 patent/WO2014115641A1/ja active Application Filing
- 2014-01-17 US US14/762,699 patent/US9324573B2/en active Active
- 2014-01-23 TW TW103102480A patent/TW201448175A/zh unknown
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US20150325454A1 (en) | 2015-11-12 |
US9324573B2 (en) | 2016-04-26 |
DE112014000543B4 (de) | 2017-06-22 |
KR20150109466A (ko) | 2015-10-01 |
TW201448175A (zh) | 2014-12-16 |
DE112014000543T5 (de) | 2015-11-12 |
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